Technique exists to serve the music, Gerard Poulet explains to acolyte Renaud Capuçon—even in the most demanding caprice of Paganini. His anecdotes are rare gems, whether about the Debussy Sonata (which his violinist father Gaston created in collaboration with the composer) or about his difficulties in justifying to the pater his fascination with Jascha Heifetz. In French with English subtitles.